9.2 (b) is the answer hope this helped!
Biannual and semiannual can be used interchangeably; they both mean “twice a year<span>.” But biennial describes something that occurs every two </span>years<span>.
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Prime numbers basically numbers that dont have any numbers that will be multiplied to get to it. So, it would be:
23
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All the other numbers in between can be divided by something and not become a decimal. Other than 23, it can be divided by anything without becoming a decimal.
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<em>~Hope this helped :)</em>